Astell & Kern AK Jr User Manual

INSTRUCTION BOOK
AK Jr
User Guide

Astell & Kern AK Jr Specifications

Display

display size	3.1 in
display resolution	240x400

Power

battery capacity	1450 mAh
battery voltage	3.7 V
operating temperature range	-5℃ ~ +45℃

Memory

built-in memory	64 GB
external memory support	microSD(Max. 64GB) x 1

Audio Performance

frequency response	±0.04 dB (20Hz~20kHz) Unbalance
s/n ratio	112 dB @ 1kHz, Unbalance
crosstalk	120 dB @ 1kHz, Unbalance
thd+n	0.005% @ 1kHz, Unbalance
output impedance	2 ohm

Weight and Dimensions

weight	3.45 oz
width	2.08 in
height	4.60 in
depth	0.35 in

Summary

Product Components

Included Accessories

Lists accessories like protective film, USB cable, Quick Start Guide, Warranty Card, and Micro SD Card Slot Cover.

Device Part Identification

External Controls and Ports

Identifies and explains the function of external parts like earphone jack, power button, and USB terminal.

On-Device Controls

Details buttons like Play/Pause, Next/Fast Forward, and the Volume wheel.

Touchscreen Interface

Explains the operation and function of the touch LCD screen.

Power Management and Reset

Device Power Control

Instructions on turning the device on, off, and managing screen power.

Automatic Power Saving Features

Explains auto-shutdown and screen timeout to conserve battery.

Reset Functionality

Guides on using the reset function for malfunctions and its implications for data.

Charging the Device

Connecting Earphones

Connecting to a Computer

Disconnecting from Computer

Copying Files to Device

Deleting Files from Device

Micro SD Card Management

Firmware Upgrade Process

Basic Device Operations

Touchscreen and List Navigation

How to operate the device using the touch LCD and navigate lists.

Music Playback Basics

Music Playback Screen Details

Music Playback Options Menu

Accessing and using options like Equalizer, Playlist, and Music Information.

USB DAC Functionality

USB DAC Technical Specifications

Details supported OS, bit depth, sample rates, and connection requirements.

USB DAC Setup and Installation

Steps for connecting the device as a USB DAC and configuring sound output.

Bluetooth Wireless Connectivity

Connecting and Managing Bluetooth

Steps to pair, connect, and disconnect Bluetooth devices.

Bluetooth Call Handling

How music playback is affected during phone calls via Bluetooth.

Managing Bluetooth Connections

Deleting Paired Bluetooth Devices

Instructions on how to remove a previously connected Bluetooth device.

Device Settings Configuration

General Setup Options

Covers basic setup, date/time, language, and brightness adjustments.

Power Saving Settings

Details auto power off, screen off, and sleep timer configurations.

Bluetooth Settings Details

Database Re-generation

Line Out Configuration

Volume Locking Feature

System Information and Formatting

Factory Settings Reset

Product Safety Precautions

General Product Safety

Warnings related to screen care, physical handling, liquids, and environment.

Usage Safety and Earphone Guidelines

Troubleshooting Common Issues

Copyright and Intellectual Property

Regulatory Compliance and Trademarks

Certifications and Approvals

Lists certifications like KCC, FCC, CE, TELEC and FCC ID information.

Registered Trademarks

Identifies registered trademarks such as Microsoft Windows.

Manufacturer's Disclaimer and Warranty

States limitations of liability and warranty information.

Detailed Product Specifications